The Time-Travelling Caveman – Terry Pratchett

Imagination is an amazing thing.
It can take you to the top of the highest mountain, or down to the bottom of the deepest depths of the sea.
This where it took Doggins on his Awfully Big Adventure: a quest full of magic and flying machines. (And the world’s best joke – trust me, it’s hilarious.)
It took three young inventors to the moon (where they may or may not have left a bottle of lemonade) and a caveman on a trip to the dentist.
You can join them on these adventures, and many more, in this incredible collection of stories . . .

From the greatest imagination there ever was.